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First trimester aneuploidy screening in the presence of a vanishing twin: implications for maternal serum markers |
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| Authors: | K Spencer I Staboulidou K H Nicolaides |
| Institution: | 1. Prenatal Screening Unit, Clinical Biochemistry Department, King George Hospital, Goodmayes, UK;2. Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, London, UK |
| Abstract: | |
| Keywords: | Down syndrome prenatal screening PAPP-A free β-hCG trisomy vanishing twin |